Motor-driven pump



Aug. 9, 1949. L. R. PETERS MOTOR-DRIVEN PUMP Filed Oct. 15, 1947 7 w a l N. Z Hm 4| I .fl/ 5 A 5 B M I a 4 a 5 I 710 3 5 A Patented Aug. 9 1949 UNITED STATES PATENT OFFICE MOTOR-DRIVEN PUMP Layman R. Peters, Peru, Ind.

Application October 13, 1947, Serial No. 779,483

2 Claims.

This invention relates to a self -contained motor driven pump unit.

The chief object of this invention is to provide a unit of the aforesaid type and which is of extremely simple construction, substantially leakproof, wherein the pressures are balanced, and wherein no shafting is exposed.

Another object of the invention is to provide such a unit that is self-sustaining and wherein, as herein disclosed, the motor is in outboard relation to the pump.

The chief feature of the present invention resides in the construction of the unit such that said objects are accomplished.

Another feature of the invention resides in the permanent lubrication of the unit resulting in long life, such lubrication feature being compatible with separability of the motor from the pump.

Other objects and features of the invention will be set forth more fully hereinafter.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims:

In the drawings Fig. 1 is a longitudinal central sectional view of the invention.

Fig. 2 is an end view of the detached motor, the pump parts normally carried by the rotor shaft being omitted.

In the left hand portion of Fig. 1, I indicates an anchoring flange, II a pump housing having central chamber l2 and a coaxial sleeve-like extension l3 to which is detachably secured the motor housing l4 closed as at l5.

The motor housing is elongated and closed by cap [6 sealed at H. The cap includes well portion l8 sealed by the combination closure plate and terminal support l9 that bears upon shoulder 20 of well forming portion IS. A nut 2| retains the insulation plate in sealing position. Plate l9 mounts terminals 22 to which the field supply lines are externally connected.

The field 23 is connected by lines 24 to said terminals. The field is supported by laminated stator 25 secured as at 26 to the shoulder 21 internally of and intermediate the ends of the motor housing 14. Disposed within the stator bore 28 is the laminated rotor 29 keyed or otherwise secured as at 30 and 3| to impeller shaft 32.

Extending inwardly from end I is the tubular bearing 33 and same may be slightly elongated externally of the housing as at 34. A flanged bushing 35 is disposed at the inner end of bearing 33 and a bushing 36, flanged at 31, is disposed in the other end of the bearing. The intermediate portion of bearing 36 is ported for lubrication.

The impeller end of shaft 32 is reduced at 38 and the end is threaded at 39. An impeller 40 is keyed thereto as at 4| and retained thereon by nut 42. A coil spring 43 bears at one end upon the impeller and at its opposite end upon a seal retainer member 44 that carries seal members 45 and 46, the latter having bearing engagement upon the flange 31 of bushing 36.

Thus the pump chamber is sealed from motor chamber and held sealed.

A cylinder 48 open at opposite ends is threaded at 49 into motor housing end wall [5. At each end is a groove to take a stop ring. Ring 50 limits piston 5| in its travel. The piston is normally constrained to that stop by spring 52 retained by stop ring 53. The piston is suitably sealed in the cylinder by 0 rings 54. The exposed end of said piston includes an anchorage formation 55 the purpose of which will be set forth later. Gasket 5'6 is interposed between the two housings. The cap I6 is apertured at 51 and a headless plug 58 is detachably secured therein.

The assembly may be effected as follows: The pressure equalizing structure (cylinder and piston) is mounted in the motor housing. The

shaft is also mounted in bearing 33 with the rotor disposed within the stator secured at 26 to the motor housing. Then the field leads are connected to the terminals 22 and the cap secured in place.

Thereafter the impeller and seal structure to be exposed in the pump chamber is applied to the shaft. The motor housing and pump nous-- ing are then secured together with gasket therebetween after the motor housing has been loaded with lubricant under pressure.

This is effected as follows: A hook is applied to anchorage 55 and the piston drawn back against spring 52 the desired amount. Then the motor housing is filled with liquid lubricant at port 51 until the housing can take no more. Plug 58 is then applied. Then the hook is released from the piston and it is urged into the motor housing, as it were, by the spring 52.

avenue Thus the lubricant trapped in the motor housing is held therein under pressure determined by spring 52. In pump operation as liquid pressure builds up in the pump chamber it is impressed on the exposed face of the piston so the lubricant pressure is at least the spring imposed pressure.

The liquid lubricant in addition to insuring lubrication also provides insulation for it can be similar to transformer oil. Also since it completely fills the motor chamber and the shaft is exposed thereto, it transmits generated heat to the motor housing for cooling purposes. Thus the unit does not run hot.

While the invention has been illustrated and described in great detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character.

The specific embodiment described herein as well as others which will readily suggest themselves to persons skilled in the art, all are con= sidered to be within the broad scope of the invention, reference being had to the appended claims The invention claimed is:

1. In a unitary motor driven pump having a pump housing, an end closure for the same. a motor housing rigid with the pump housing, an end closure for the motor housing, at least one closure being integral with a housing, a shaft projecting from one housing to the other housing, a rotor on the shaft in the motor housing, an impeller on the shaft in the pump housing, the shaft terminating short of both closures, the motor housing being of the completely closed type, an elongated shaft supporting sleeve bearing, division means between the housings and .supporting the sleeve housing, and a pressure yieldable seal structure interposed between housings for retaining lubricant in the motor housing while subject to pump pressure.

2. A pump as defined by claim 1 wherein the seal structure comprises a cylinder open at opposite ends to the respective housings. a piston in the cylinder and having limited reciprocation therein, and a pressure applying member normally constraining th piston toward the motor housing interior for lubricant pressure maintenance therein.

LAYMAN R. PETERS.

REFERENCES CITED The following references are of record in the tile of this patent:

UNITED STATES PATENTS Number Name Date 2,002,907 Sessions May 28, 1935 2,002,911 Mendenhall et a1. May 28, 1935 2,326,360 Ingersoll Aug. 10, 1943 2,423,436 Blom July 8, 1947 

